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A 8.40-{\rm kg} block of ice, released from rest at the top of a 1.24-{\rm m}-long frictionless ramp, slides downhill, reaching a speed of 2.65 {\rm m/s} at the bottom.
A. What is the angle between the horizontal and the ramp?
B. What would be the speed of the ice at the bottom if the motion were opposed by a constant friction force of 10.8 {\rm N} parallel to the surface of the ramp?
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A transformer connected to a 120 V ac line needs to supply 12,500 Vac to power an immense neon sign used as a business advertisement. What is the ration of secondary to primary turns of the transformer needed in order to make the sing light-up?
(a) compute the absolute pressure at the bottom of a freshwater lake at a point whose depth is 25.5 m. assume the density of the water is 1.00 x10^3 kg/m3 and the air above is at the pressure of 101.3 kPa.
Diffracted light from a circular aperture is viewed on a distant viewing screen, Find the radius of the aperture if the wavelength of light is 680 nm
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a calculate the limiting visual brightness in magnitudes for naked eye viewing through a 10-m telescope. assume the eye
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A 5 cm tall object is placed 20 cm to the left of a converging lens with focal length of 10 cm. What is the magnification of the image
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